Description
The MS-Expand file handling in Clam AntiVirus (ClamAV) before 0.86 allows remote attackers to cause a denial of service (file descriptor and memory consumption) via a crafted file that causes repeated errors in the cli_msexpand function.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗Advisories 2
- DSA-737-1 clamav - various DOS vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
- DTSA-3-1 clamav - denial of service and privilege escalation Debian Security (DSA / DLA) · Mar 9, 2026
References
- 20050629 Clam AntiVirus ClamAV MS-Expand File Handling DoS Vulnerability third-party-advisory
- http://sourceforge.net/project/shownotes.php?release_id=336462
- DSA-737 vendor-advisory